Abstract
This study investigated the effect of sesamin on myocardial fibrosis in spontaneously hypertensive rats (SHRs) and the possible mechanisms involved. Twenty-eight male SHRs were randomly allocated to SHR group, Ses160 group (sesamin 160 mg/kg), Ses80 group (sesamin 80 mg/kg) and Cap30 group (captopril 30 mg/kg). Seven male WKY rats were used as control. Sesamin and captopril were administered intragastrically for 12 weeks. Captopril significantly reduced systolic blood pressure and angiotensin II (Ang II) levels in SHRs, accompanied by a marked attenuation of left ventricular hypertrophy (LVH) and collagen deposition (P <0.05 or P <0.01). Though sesamin had no significant influence on Ang II levels, and the hypotensive effect was also significantly inferior to that of captopril (P <0.05 or P <0.01), however, the improvement of LVH and collagen deposition was similar to that in captopril group. Sesamin markedly reduced transforming growth factor-β1 (TGF-β1) content in cardiac tissues, with Smad3 phosphorylation decreased and Smad7 protein expression increased notably (P <0.05 or P <0.01). Protein expression of type I collagen and type III collagen, target genes of Smad3, was down-regulated markedly by sesamin (P <0.05 or P <0.01)...Continue Reading
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